Esclarecimento sobre conversor Video
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Miguel Linhares
- Fanático
- Posts: 881
- Joined: February 3rd, 2002, 6:53 pm
- Location: Portugal
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by COIA</i>
<br />Mas afinal a diferença de 10 bits a 27 Mhz para 12 bits a 108 Mhz vale a pena ou não ? 100 € vale a diferença ?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
E eu a perder esta pérola…
COIA, aqui vai um "copy & paste" de uma resposta do Udo Zucker (CEO da Tag) a uma pergunta semelhante:
*
Hi Theodor, mass-market products are designed and sold by superlatives. There are thousands of examples of poorly performing products in the market which come with an impressive specification.
Higher and higher frequencies and larger and larger bit numbers have always been subject of this misuse. Remember those 16bit, 18bit, 20bit, 24bit race for Audio DACs? It is the consumers' inability to understand the technical details which allow companies to get away with it.
TAG McLaren Audio's position is to use engineering principles only, and I admit, in doing this we make better products but make also the lives of our marketing team 'hell'. We have to leave it to the customer to trust us and if they are in doubt, check the implementation of technology in action with a good retailer or discuss their concern with other customers in this forum, just as you did.
BTW, video data recorded on a DVD disc is 8bit only. It is therefore important to recognise that a 9bit DAC would already have the full performance, in bit terms, than required and that other parameters will define the final picture quality.
Now fasten your seatbelt, the technical stuff arrives: Those 'high performance' video DACs, which come in 11, 12 and 14-bit variants have a specification which is not as good as the parts used on PSM192 9 (you need to compare progressive outputs here, as interlaced is far less demanding), and they would be far too slow for VSM2048. So for best picture quality use a DVD32 + PSM192 + VSM2048.
Here are the details for the technical minded: In progressive scan mode the devices have 12.5MHz luma bandwidth (should be 13.5MHz) and 5.8M chroma bandwidth (should be 6.75MHz). Could account for the poor freq response of some players when tested, which shows the response falling off from 5MHz. S/N is 64dB for a luma ramp and 79dB for flat field (the 11 and 12 bit variants of the 108MHz parts only manage 59dB and 62dB respectively for luma ramp).
The '7196 TAG Mclaren Audio uses has the required 13.5MHz luma BW, 6.75MHz Chroma BW and the same 64dB luma ramp S/N as the 14-bit 108MHz part.
Based on the info above TAG McLaren would not have selected these 'super' DACs except we had fallen untrue of our engineering beliefs. You wouldn't want that, would you
Miguel Linhares
Coimbra
<br />Mas afinal a diferença de 10 bits a 27 Mhz para 12 bits a 108 Mhz vale a pena ou não ? 100 € vale a diferença ?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
E eu a perder esta pérola…
COIA, aqui vai um "copy & paste" de uma resposta do Udo Zucker (CEO da Tag) a uma pergunta semelhante:
*
Hi Theodor, mass-market products are designed and sold by superlatives. There are thousands of examples of poorly performing products in the market which come with an impressive specification.
Higher and higher frequencies and larger and larger bit numbers have always been subject of this misuse. Remember those 16bit, 18bit, 20bit, 24bit race for Audio DACs? It is the consumers' inability to understand the technical details which allow companies to get away with it.
TAG McLaren Audio's position is to use engineering principles only, and I admit, in doing this we make better products but make also the lives of our marketing team 'hell'. We have to leave it to the customer to trust us and if they are in doubt, check the implementation of technology in action with a good retailer or discuss their concern with other customers in this forum, just as you did.
BTW, video data recorded on a DVD disc is 8bit only. It is therefore important to recognise that a 9bit DAC would already have the full performance, in bit terms, than required and that other parameters will define the final picture quality.
Now fasten your seatbelt, the technical stuff arrives: Those 'high performance' video DACs, which come in 11, 12 and 14-bit variants have a specification which is not as good as the parts used on PSM192 9 (you need to compare progressive outputs here, as interlaced is far less demanding), and they would be far too slow for VSM2048. So for best picture quality use a DVD32 + PSM192 + VSM2048.
Here are the details for the technical minded: In progressive scan mode the devices have 12.5MHz luma bandwidth (should be 13.5MHz) and 5.8M chroma bandwidth (should be 6.75MHz). Could account for the poor freq response of some players when tested, which shows the response falling off from 5MHz. S/N is 64dB for a luma ramp and 79dB for flat field (the 11 and 12 bit variants of the 108MHz parts only manage 59dB and 62dB respectively for luma ramp).
The '7196 TAG Mclaren Audio uses has the required 13.5MHz luma BW, 6.75MHz Chroma BW and the same 64dB luma ramp S/N as the 14-bit 108MHz part.
Based on the info above TAG McLaren would not have selected these 'super' DACs except we had fallen untrue of our engineering beliefs. You wouldn't want that, would you
Miguel Linhares
Coimbra
<b>"E quem te disse que eu vou usar o denver? Afinal não és bruxo"</b>
Estou mais descansado, mas pouco, palpita-me que vais comprar um daqueles com DVI, mas de qualidade equivalente ao Denver, só por curiosidade, testa um melhorzinho com PS, e conta o que vês... [}:)]
Para não falar do som, mas isso é questão de gosto, tu preferes a imagem, eu o som... [8D]
Antonio Melo Ribeiro
Estou mais descansado, mas pouco, palpita-me que vais comprar um daqueles com DVI, mas de qualidade equivalente ao Denver, só por curiosidade, testa um melhorzinho com PS, e conta o que vês... [}:)]
Para não falar do som, mas isso é questão de gosto, tu preferes a imagem, eu o som... [8D]
Antonio Melo Ribeiro